GO A handclap on stage in an amphitheater sends out sound waves that scatter from terraces of width w = 0.75 m (Fig. 17-33). The sound returns to the stage as a periodic series of pulses, one from each terrace; the parade of pulses sounds like a played note, (a) Assuming that all the rays in Fig. 17-33 are horizontal, find the frequency at which the pulses return (that is, the frequency of the perceived note). (b) If the width w of the terraces were smaller, would the frequency be higher or lower? Figure 17-33 Problem 15.
GO A handclap on stage in an amphitheater sends out sound waves that scatter from terraces of width w = 0.75 m (Fig. 17-33). The sound returns to the stage as a periodic series of pulses, one from each terrace; the parade of pulses sounds like a played note, (a) Assuming that all the rays in Fig. 17-33 are horizontal, find the frequency at which the pulses return (that is, the frequency of the perceived note). (b) If the width w of the terraces were smaller, would the frequency be higher or lower? Figure 17-33 Problem 15.
GO A handclap on stage in an amphitheater sends out sound waves that scatter from terraces of width w = 0.75 m (Fig. 17-33). The sound returns to the stage as a periodic series of pulses, one from each terrace; the parade of pulses sounds like a played note, (a) Assuming that all the rays in Fig. 17-33 are horizontal, find the frequency at which the pulses return (that is, the frequency of the perceived note). (b) If the width w of the terraces were smaller, would the frequency be higher or lower?
Figure 17-37 shows a transmitter and receiver of waves con- tained in a single instrument. It is used to measure the speed u of a target object (idealized as a flat plate) that is moving directly toward the unit, by analyzing the waves reflected from the target. What is u if the emitted frequency is 18.0 kHz and the detected frequency (of the returning waves) is 22.2 kHz?
GO Figure 16-46 shows
transverse acceleration a, versus
time t of the point on a string at
70
x = 0, as a wave in the form of
y(x, t) = ym sin (kx – wt + 4)
passes through that point. The
scale of the vertical axis is set
%3D
by a, = 400 m/s². What is ?
Figure 16-46 Problem 70.
(Caution: A calculator does not
always give the proper inverse trig function, so check your answer by
substituting it and an assumed value of w into y(x, t) and then plotting
the function.)
2 In Fig. 16-24, wave 1 consists of a rectangular peak of height 4 units
and width d, and a rectangular valley of depth 2 units and width d. The
wave travels rightward along an x axis Choices 2, 3, and 4 are similar
waves, with the same heights, depths, and widths, that will travel leftward
along that axis and through wave 1. Right-going wave 1 and one of the
left-going waves will interfere as they pass through each other. With
which left-going wave will the interference give, for an instant, (a) the
deepest valley, (b) a flat line, and (c) a flat peak 2d wide?
(1)
(2)
(3)
(4)
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